Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aef8e4340fa7259…

MALICIOUS

PDF

41.3 KB Created: 2020-08-25 20:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a391125f18d3a90ac1fa765edcc4047 SHA-1: 054602ef1c533fd619cdd74ca5b9feae94556f92 SHA-256: 3aef8e4340fa7259a42097ead104d8bcd90b399d5951073b43667a0eef4a945f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=samsung+galaxy+xcover+gt+s5690+user+manual', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure the user into clicking the malicious link. The presence of numerous other links to Shopify, some benign and some unknown, indicates a link farm strategy to improve SEO and potentially mask malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=samsung+galaxy+xcover+gt+s5690+user+manual
    • http://xivaf.lindasdesignersgroup.com/uploads/1/3/1/6/131636719/6012350.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/bikol_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4551/files/behringer_xenyx_2442fx_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/accounting_terms_glossary.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/biostar_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/ziliradenumax.pdf
    • https://cdn.shopify.com/s/files/1/0437/5412/7521/files/android_device_secret_codes.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/love_rosie_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/naughts_and_crosses.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/tefexetuwozufex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006100.bin
a76382573f0397b7958dbbc25ee26eba472d5121efa3a4840c90f490bda75ab7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6100 6028 bytes
font_01_sfnt_off00007572.bin
b657345fad0c9bf376feb1a54c5cb3ba953e4ea23bd5dd917db12c0dba690f73
pdf-font-stream PDF embedded font (sfnt) at offset 0x7572 10376 bytes